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🇹🇼 Solar Calculator Taiwan

Enter your monthly electricity bill and county — get solar system size, 20-year guaranteed FIT income (NT$4.25–5.70/kWh), payback period, and roof lease passive income option.

Your electricity details
NT$TWD
Solar system results — Taiwan
3 kWp system — 1022 kWh/kWp/yr
Annual solar production3066 kWh/yr
20-year FIT rateNT$4.25 – NT$5.70/kWh (guaranteed)
Self-consumption savingsNT$3,434/yr
FIT export income (20yr locked)NT$9,765/yr
Total annual benefitNT$13,199/yr ($412)
20-year FIT total incomeNT$263,983
System costNT$120,000 – NT$165,000 ($3,750–$5,156)
Payback period10.8 years
25-year net savingsNT$187,478
20-Year FIT Guarantee: Taiwan's Feed-in Tariff rate is locked in for 20 years from grid connection. This makes Taiwan solar one of Asia's lowest-risk solar investments. Apply through Taipower (Taiwan Power Company) before installation.
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How to Use This Calculator

Enter your bill and county

Enter your monthly electricity bill in New Taiwan Dollars (NT$) from Taiwan Power Company (Taipower). Taiwan uses a tiered residential pricing structure — the more you consume, the higher the rate per kWh. Select your county — Kaohsiung (4.4 PSH) and Pingtung (4.4 PSH) in southern Taiwan receive the most solar irradiance; Taipei and New Taipei (3.5 PSH) receive considerably less due to cloud cover and rain.

Choose FIT year and ownership model

Select the Feed-in Tariff (FIT) year — Taiwan's Bureau of Energy announces FIT rates annually. The rate you receive is locked in for 20 years from the date of grid connection. Applying earlier when rates are higher locks in better economics for two decades. Enable the roof lease option if you prefer zero upfront cost in exchange for passive rental income from a solar developer.

Roof lease vs. owning your system

Taiwan's roof lease model (屋頂租賃) is popular for homeowners who cannot afford upfront installation costs. A solar company installs the system for free, receives 80–90% of FIT income, and pays you 10–20% as roof rental income for 20 years. If you can afford the upfront cost (NT$40,000–55,000/kWp), owning delivers far higher total returns. Typical payback: 7–9 years, followed by 11–13 years of pure profit.

The Formula

Annual production = kWp × PSH × 365 × 0.80 efficiency Self-consumption (35%) = Annual kWh × 0.35 × NT$3.20/kWh retail FIT export (65%) = Annual kWh × 0.65 × FIT rate (NT$4.25–5.70/kWh, 20yr locked) Total annual benefit = Self-consumption savings + FIT export income Installation cost = NT$40,000–55,000/kWp (~USD $1,250–$1,700/kWp) Payback = Total cost ÷ Annual benefit (typically 7–9 years) Roof lease: Owner receives 15% of FIT income, 0 upfront

Taiwan's FIT program (再生能源發展條例) was established under the Renewable Energy Development Act. The Bureau of Energy (能源局) sets annual FIT rates, which are typically higher for smaller residential systems. Rates range from NT$4.25/kWh for large commercial systems to NT$5.70/kWh for small residential rooftops. The 20-year FIT guarantee makes Taiwan one of Asia's most bankable solar markets. All grid-connected solar systems must be approved and metered by Taipower.

Example

Wei-Chen — Kaohsiung villa, 10kWp, sunniest city

Wei-Chen pays NT$4,000/month for his Kaohsiung villa. He installs a 10kWp system to maximize output from Kaohsiung's 4.4 PSH solar resource and locks in the 2026 FIT rate of NT$4.90/kWh average for 20 years.

Monthly billNT$4,000
County / PSHKaohsiung, 4.4 PSH
System size10 kWp
FIT year2026 (NT$4.25–5.70/kWh)
Roof leaseNo — own the system

Result

Annual production~12,848 kWh/yr
Production per kWp~1,285 kWh/kWp/yr
Self-consumption savings~NT$14,287/yr
FIT export income~NT$27,342/yr (20yr locked)
Total annual benefit~NT$41,629/yr
20-year FIT total income~NT$832,580
System costNT$400,000–550,000 (~$12,500–$17,200 USD)
Payback~9.0 years
25-year net savings~NT$565,700

Taiwan's 20-year FIT guarantee means Wei-Chen's income is secured for two decades regardless of future electricity price changes. After payback, the remaining 11+ years of income is pure profit. The 20-year total FIT income of NT$832,580 far exceeds the NT$475,000 installation cost.

FAQ

Yes — Taiwan's 20-year Feed-in Tariff guarantee makes solar one of Asia's lowest-risk investments. Southern Taiwan (Kaohsiung, Tainan, Pingtung) receives 4.3–4.4 PSH, producing 1,250–1,350 kWh/kWp/year. Combined with FIT rates of NT$4.25–5.70/kWh (much higher than retail electricity at NT$3.20/kWh average), payback periods of 7–9 years are typical. Taiwan's government targets 20GW solar by 2025 — strong policy support makes this an excellent time to invest.
Taiwan's FIT program guarantees a fixed purchase price for all solar electricity exported to the grid for 20 years. Annual FIT rates are set by the Bureau of Energy (能源局) and announced each year. The rate you receive is locked at the year you connect to the grid — not adjusted annually. To apply: (1) Contact a certified installer. (2) Submit installation plan to Taipower. (3) Obtain grid connection approval. (4) Commission the system. (5) Sign the 20-year FIT contract with Taipower. Residential systems under 10kW get priority approval.
Taiwan's roof lease (屋頂租賃) model allows homeowners to monetize their roof without any upfront cost. A solar developer installs the system at their expense, receives 80–90% of FIT income, and pays you a roof rental fee (typically 10–20% of FIT income or a fixed NT$2,000–5,000/month per 10kWp). After 20 years, the system may be transferred to you. Negotiate carefully: higher roof shares (18–22%) are achievable in southern Taiwan. Ensure the lease agreement is registered with the Land Registry to protect your interests.
Installed solar system costs in Taiwan range from NT$40,000–55,000 per kWp (approximately USD $1,250–$1,700/kWp). A 5kWp residential system costs NT$200,000–275,000. Costs have declined significantly since 2020. Taiwanese panel brands (Motech, Neo Solar) and Chinese brands (Jinko, LONGi) are both available. Installation typically takes 1–3 days. Government subsidies may be available through the Energy Bureau — check taipower.com.tw for current programs.
Kaohsiung (4.4 PSH) and Pingtung (4.4 PSH) in southern Taiwan are the sunniest. Tainan (4.3 PSH) is also excellent. Taichung (4.0 PSH) offers good resources in central Taiwan. Hualien (3.7 PSH) on the east coast is moderate. Taipei and New Taipei (3.5 PSH) have the least sun due to persistent cloud cover from the Keelung Basin. Solar panels still work efficiently in northern Taiwan — just with lower annual production.

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